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January 5, 2010

Winter weather terminology

Like the terminology in many businesses, the words used among weather forecasters can be confusing. What is the difference between an ice storm warning and a winter weather warning? What triggers a blizzard warning?

Mary Knapp, who serves as the state climatologist for Kansas, provided definitions for several winter weather-related terms and phrases. Knapp directs the state’s Weather Data Library, based in K-State Research and Extension at Kansas State University.

•Winter Storm Watch: Possible heavy snow, and/or significant accumulation of freezing rain/drizzle or sleet.

•Snow Advisory: Worsening travel conditions with 1 to 5 inches of snow.

•Winter Weather Advisory: Combined snow with accumulations of freezing rain/drizzle or sleet.

•Freezing Rain Advisory: Travel problems are expected due to accumulated freezing rain. Damage to trees or power lines not expected.

•Sleet Advisory: Accumulation of between 1/4 and 1 inch of sleet is expected.

•Winter Storm Warning: Combination of heavy snow, significant accumulations of freezing rain/drizzle or sleet, and low wind chill.

•Heavy Snow Warning: Snowfall accumulation to 6 inches or more in 12 hours, or 8 inches or more in 24 hours.

•Blizzard Warning: Winds 35+ miles per hour, considerable falling and/or blowing snow (visibilities frequently less than 1/4 mile) for at least 3 hours.

•Ice Storm Warning: Significant, and possibly damaging, accumulations of ice. Wind is an important factor in powerline/tree line damage. If nearly calm, accumulations can go to 1/2 inch; with higher winds breakage can occur with around 1/4 inch of accumulation.

Information about Kansas weather is available on the Weather Data Library Website at:

www.ksre.ksu.edu/wdl/

“Weather Wonders” audio reports are available on the K-State Research and Extension News Media Website at: www.ksre.ksu.edu/news/.

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